Question: Dominant and Recessive Genes. Many traits are controlled by a dominant gene, A, and a recessive gene, a. A child gets two genes; one from each parent. Suppose a child’s parents each have the gene combination Aa; that is, each parent is equally likely to pass either the A or the a gene to the child. Make a table showing the probability distribution for the child’s possible gene combinations, which are AA, Aa, and aa. If the combinations AA and Aa both result in the same dominant trait (say, brown hair) and no results in the recessive trait (say, blond hair), what is the probability that a child will have the dominant trait? What is the probability that the child will have the recessive trait?

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